Self-balancing plansifter



Nov. 25, 1930'. npQLmzvsAg 1,782,561

SBU' BALAIICIIIG PLANSIHIR mm sape. 4, 1929 nia/ly The essence of the inventionconsists Patented Nov. 25,1930

Y FRANKBonmZsAa, orRAKosPALoTmVHINGARYi f lj, i .,fsniirj-BLANCING lriiANsIrrEitf i i The invention relates 'to an arrangement on self-balancing plansifters in which the counter-balancing (governor) weights are arrangedabove and-below the sieve case on the two ends of a shaft passing through the case. p

For the purpose of the invention, an arrangement has to be 'contrived which ensures perfect running and in particular the sta-.rting and stopping of the sieve without shock, which hitherto it has been only possible to incompletely attain with plan-sitters of this type attaching the case to the floor by means of spring shock absorbers.

principallyin an improved and suitable construe# Vtion of the shaft carrying the balancing "weights and passing through the centreof gravity of the sieve case. For this purpose, the shaft consists of three parts linked together. p y

The invention further consists in thatfor the purpose of connecting the parts-of the .shaft together resilient links areused, to-

i" getherwith self adjusting (swivel) lbearings plan-sitter is always in a practically verticalV for carrying thegseparate parts, so that "the shaft parts can occupy positions with varying angles with respect to each other.

The principal characteristic of the invention is thatthe driving shaftvof the improved position and consequently the sieve boX, both in the position of rest as well as when work? ing, independent of the speed' of rotation at `the moment, does not move out of its prescribed circular path.`

In the drawing, Figure l shows a front l view` and Figure 2 a cross section of the plansifter suspended in theusual manner. Figures 3 and 4 show two diagrams of the drive and counter-balancing apparatus in two different positions. Figure 5 is a detailed drawing of the shaft link on a larger scale.

On the drawing, l indicates the sieve box, 2 the suspension bars (reeds), 3 the driving shaft, 4 and 5 theV arms formed-as discs sup- 1 porting the upper and lower balance-weights said discs being connected together by means of a shaft composed of the parts 8,9, linked together .by the linkso, 7. These shaftfparts ``2116 rotates preferably in afswivel bearing 17 V `tirely free of shocks; as-we`l11 as are carried on the casing in selfiadjusting '(swivell "bearings Il,` 12"'l3,jand;`when proper balancefweights are used-#lie linfthe line of the "centre' of gravityof the case, ec"- centricgto the aXis of the driving shaftS.

Similarly the` balancing weights [14, Q15 "lie eccentric to this shaft but with -fii'correspon'dingly greater eccentricity, and-arrangedion the other end of thearms 4 and 5;`-` rj 'Ihe eccentricity between Vidrivingshaft '60 of the `circular :pathof the sieve casa" The n driving'shaft provided with-[the belt pulley arrangedfonk the-"ceiling f 'B15 coupled with eye joints,i.`` e; the pin 18 isca-rried in an' oblong slot 191so that a slight axialy displacementof the connectedpartsis made possible: In 'consequence ofi this farrange- 70 ment, as also ofthe swivel bearings, theshvaft parts on` the occurrence of` a considerabl'elal The links 6,: `7` are, as shwnl inJ Figure 5,

teration in the weight,icanadjustrthemselves accordingrl'tothe zig zag lineas 'shownin FigureB. Y i It is important that the #axes ofA theishafts as also the centreof gravity vof the sieve box and yof the balancing weights should bein a common plane (the plane of the drawing) andinparticularthat the linkslshould.be` so adjusted that theffoscillatingplane ofthe l'shaft partsy should coincide with the .planet` Y? t The rotating weights 14, 15 are` chosen in such` mannenthat "thefsieve `box istfully counter-balanced, t and. consequently the g5 parts of the drive, bothinthe standin con-` dition vas `well aswhenworking, shoul take up p the lposition shown :in "Figures i1," 2, and 4 which u position corresponds l ltof'; that occupied in each point `ofthe horizontalfcircular path of the sieve. The" arrangement mentioned of theulinks and ofthe bearings-per# p mits :the driving shaft `3 to remain' always vertical and thus astarting and stoppingien perfect: rune` ningof thesievebox iseensured. 11 In thediagram 'according` toFigureB, the balancingweightsare assumed tojbe removed (as shown for example, by theV empty circles ment of the separate parts greatly exaggerated for the sake of clearness. The casing Would in this case, as no counter balance Weights act thereon, take up its lowest position so that the suspension rods 2 assume the vertical position. On the other hand, the driving shaft .which is in rigid connection With the arm 4 and the shaft part 8 Would, in consequence of the horizontal displacement of the casing 1, take up the inclined position shown and consequently the two other parts of the shaft and the arm 5 also, Would adjust themselves in the manner shown. If now the counterWeights are inserted as shown for instance by the shaded circles, 14, l5 Figure 4,) that is, the load increased until the driving shaft 3 assumes the vertical position (Figure 4C), then the counter 4balance position is reached, the shaft parts 8, 9, l0 attain a position parallel to the driving shaft, and the sieve case is brought into its circular orbit in which position it remains unchanged during working.

What I claim and-desire to secure by Letters Patent of the United States is '1. Arrangement for sel-f balancing plansifters comprising a sieve'case, a three part linked shaft passing through said case, self adjusting bearingsV mounted in said case and carrying said shaft, arms lrigidly connected with the ends of said shaft, balance masses arranged on said arms and a rigid driving shaft connected with one of said arms.

2. Arrangement for self balancing plansifters comprising a sieve case, a three part linked shaft passing through said case, self adjusting bear-ings mounted in said case carrying said shaft, arms rigidly connected with ythe k.endslof said shaft, balance masses arranged on said arms and a rigid driving shaft connected with one of said arms at a distance from said rthree part linked shaft corresponding to the circular path of the sieve.

3. Arrangement for self balancing plansifters comprising a sieve case, a three part linked shaft carried through the centre of gravity of said sieve case, self adjusting bearings mountedV in said case and carrying said shaft, arms rigidly connected with the ends of said shaft, balance masses arranged on ,said arms, and a rrigid driving shaft rigidly connected with one of said arms.

4. Arrangement for self balancing plansifters comprising asieve case, a three part linked shaft the mid point of which lies `at the centre of gravityof the sieve case, arms rigidly connected with the ends of said shaft, self adjusting bearings mounted in said case and carrying said shaft, balance masses arranged on said arms, and a rigid driving shaft connected With one :of said arms.

5. Arrangement for self balancing plansifters comprising a sieve case, a three Vpart linked shaft-passing :through said case said one plane only, arms carrying balance masses rigidly connected With the ends of said shaft and a rigid driving shaft connected with one ofsaid arms the axes of each `of said shafts lying in the plane in Which the links are adapted to oscillate.

FRANK BOLDIZSR. 

